Hi Andreas.Hi Hiroshi,
It can't be operated by the table which has one column. Operation is drop. This becomes the table of the sky. You should prevent Drop operation from doing it if it is presumed injustice operation though the intention of this operation is strange.
I think that it should do this patch from the flow.
Which is better?
I can't see a problem about the present code (with 7.3), a table must have at least one column. If you dropped the last in that columns list, you must add another to have a working table.
I just added the new 7.4's feature, being able to have zero columns (whatever that's good for...).
Regards, Andreas
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